高分辨SAR运动误差分析

Motion Error Analysis for High Resolution SAR

分析了高分辨合成孔径雷达(SAR)成像中存在的运动误差,并从理论上分析了位置误差和角度误差对脉冲压缩的影响,理论分析表明运动误差对方位向相位造成的影响是主要的。在位置误差分析的基础上讨论了近似运动补偿产生的残余相位误差。然后在理论分析的基础上,对近似补偿产生的残余误差进行了仿真,验证了运动补偿的难点在于如何提高运动参数的精度以补偿方位向的相位误差。

Motion error and its impact is analyzed on the impulse compression in high resolution SAR imaging from position error and angle error respectively.It proves that the motion error impact on the azimuth phase is primary.The residual phase error is discussed in the process of approximative motion compensation on basis of position error analysis.After theoretic analysis,computer simulation is presented.It confirms that the difficulty in motion compensation is how to improve the accuracy of motion parameters to compensate the phase error in azimuth direction.